2 * $Id: afp_dsi.c,v 1.51 2010-02-16 02:37:38 didg Exp $
4 * Copyright (c) 1999 Adrian Sun (asun@zoology.washington.edu)
5 * Copyright (c) 1990,1993 Regents of The University of Michigan.
6 * All Rights Reserved. See COPYRIGHT.
8 * modified from main.c. this handles afp over tcp.
13 #endif /* HAVE_CONFIG_H */
22 #endif /* HAVE_UNISTD_H */
23 #include <sys/socket.h>
25 #ifdef HAVE_SYS_STAT_H
27 #endif /* HAVE_SYS_STAT_H */
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
30 #include <atalk/logger.h>
32 #include <atalk/dsi.h>
33 #include <atalk/compat.h>
34 #include <atalk/util.h>
44 #endif /* FORCE_UIDGID */
46 #define CHILD_DIE (1 << 0)
47 #define CHILD_RUNNING (1 << 1)
48 #define CHILD_SLEEPING (1 << 2)
49 #define CHILD_DATA (1 << 3)
58 static void afp_dsi_close(AFPObj *obj)
60 DSI *dsi = obj->handle;
62 /* we may have been called from a signal handler caught when afpd was running
63 * as uid 0, that's the wrong user for volume's prexec_close scripts if any,
64 * restore our login user
66 if (seteuid( obj->uid ) < 0) {
67 LOG(log_error, logtype_afpd, "can't seteuid back %s", strerror(errno));
74 LOG(log_info, logtype_afpd, "%.2fKB read, %.2fKB written",
75 dsi->read_count/1024.0, dsi->write_count/1024.0);
80 /* -------------------------------
82 * a little bit of code duplication.
84 static void afp_dsi_die(int sig)
86 static volatile int in_handler;
91 /* it's not atomic but we don't care because it's an exit function
92 * ie if a signal is received here, between the test and the affectation,
97 dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN);
98 afp_dsi_close(child.obj);
99 if (sig) /* if no signal, assume dieing because logins are disabled &
100 don't log it (maintenance mode)*/
101 LOG(log_info, logtype_afpd, "Connection terminated");
102 if (sig == SIGTERM || sig == SIGALRM) {
111 static void afp_dsi_sleep(void)
113 child.flags |= CHILD_SLEEPING;
114 dsi_sleep(child.obj->handle, 1);
117 /* ------------------- */
118 static void afp_dsi_timedown(int sig _U_)
123 child.flags |= CHILD_DIE;
124 /* shutdown and don't reconnect. server going down in 5 minutes. */
125 setmessage("The server is going down for maintenance.");
126 if (dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
127 AFPATTN_MESG | AFPATTN_TIME(5)) < 0) {
128 DSI *dsi = (DSI *) child.obj->handle;
129 dsi->down_request = 1;
132 it.it_interval.tv_sec = 0;
133 it.it_interval.tv_usec = 0;
134 it.it_value.tv_sec = 300;
135 it.it_value.tv_usec = 0;
137 if ( setitimer( ITIMER_REAL, &it, NULL ) < 0 ) {
138 LOG(log_error, logtype_afpd, "afp_timedown: setitimer: %s", strerror(errno) );
139 afp_dsi_die(EXITERR_SYS);
141 memset(&sv, 0, sizeof(sv));
142 sv.sa_handler = afp_dsi_die;
143 sigemptyset( &sv.sa_mask );
144 sigaddset(&sv.sa_mask, SIGHUP);
145 sigaddset(&sv.sa_mask, SIGTERM);
146 sv.sa_flags = SA_RESTART;
147 if ( sigaction( SIGALRM, &sv, NULL ) < 0 ) {
148 LOG(log_error, logtype_afpd, "afp_timedown: sigaction: %s", strerror(errno) );
149 afp_dsi_die(EXITERR_SYS);
153 sv.sa_handler = SIG_IGN;
154 sigemptyset( &sv.sa_mask );
155 sv.sa_flags = SA_RESTART;
156 if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
157 LOG(log_error, logtype_afpd, "afp_timedown: sigaction SIGHUP: %s", strerror(errno) );
158 afp_dsi_die(EXITERR_SYS);
162 /* ---------------------------------
163 * SIGHUP reload configuration file
164 * FIXME here or we wait ?
166 volatile int reload_request = 0;
168 static void afp_dsi_reload(int sig _U_)
173 /* ---------------------------------
174 * SIGINT: enable max_debug LOGging
176 static volatile sig_atomic_t debug_request = 0;
178 static void afp_dsi_debug(int sig _U_)
183 /* ---------------------- */
185 static void afp_dsi_getmesg (int sig _U_)
187 DSI *dsi = (DSI *) child.obj->handle;
189 dsi->msg_request = 1;
190 if (dsi_attention(child.obj->handle, AFPATTN_MESG | AFPATTN_TIME(5)) < 0)
191 dsi->msg_request = 2;
193 #endif /* SERVERTEXT */
195 static void alarm_handler(int sig _U_)
198 DSI *dsi = (DSI *) child.obj->handle;
200 /* we have to restart the timer because some libraries
202 setitimer(ITIMER_REAL, &dsi->timer, NULL);
204 /* we got some traffic from the client since the previous timer
206 if ((child.flags & CHILD_DATA)) {
207 child.flags &= ~CHILD_DATA;
211 /* if we're in the midst of processing something,
213 if ((child.flags & CHILD_SLEEPING) && child.tickle++ < child.obj->options.sleep) {
217 if ((child.flags & CHILD_RUNNING) || (child.tickle++ < child.obj->options.timeout)) {
218 if (!(err = pollvoltime(child.obj)))
219 err = dsi_tickle(child.obj->handle);
221 afp_dsi_die(EXITERR_CLNT);
223 } else { /* didn't receive a tickle. close connection */
224 LOG(log_error, logtype_afpd, "afp_alarm: child timed out");
225 afp_dsi_die(EXITERR_CLNT);
230 if dsi->in_write is set attention, tickle (and close?) msg
231 aren't sent. We don't care about tickle
233 static void pending_request(DSI *dsi)
235 /* send pending attention */
237 /* read msg if any, it could be done in afp_getsrvrmesg */
238 if (dsi->msg_request) {
239 if (dsi->msg_request == 2) {
240 /* didn't send it in signal handler */
241 dsi_attention(child.obj->handle, AFPATTN_MESG | AFPATTN_TIME(5));
243 dsi->msg_request = 0;
244 readmessage(child.obj);
246 if (dsi->down_request) {
247 dsi->down_request = 0;
248 dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
249 AFPATTN_MESG | AFPATTN_TIME(5));
253 /* -------------------------------------------
254 afp over dsi. this never returns.
256 void afp_over_dsi(AFPObj *obj)
258 DSI *dsi = (DSI *) obj->handle;
261 struct sigaction action;
263 obj->exit = afp_dsi_die;
264 obj->reply = (int (*)()) dsi_cmdreply;
265 obj->attention = (int (*)(void *, AFPUserBytes)) dsi_attention;
267 obj->sleep = afp_dsi_sleep;
269 child.tickle = child.flags = 0;
271 memset(&action, 0, sizeof(action));
274 action.sa_handler = afp_dsi_reload;
275 sigemptyset( &action.sa_mask );
276 sigaddset(&action.sa_mask, SIGALRM);
277 sigaddset(&action.sa_mask, SIGTERM);
278 sigaddset(&action.sa_mask, SIGUSR1);
279 sigaddset(&action.sa_mask, SIGINT);
281 sigaddset(&action.sa_mask, SIGUSR2);
283 action.sa_flags = SA_RESTART;
284 if ( sigaction( SIGHUP, &action, NULL ) < 0 ) {
285 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
286 afp_dsi_die(EXITERR_SYS);
289 /* install SIGTERM */
290 action.sa_handler = afp_dsi_die;
291 sigemptyset( &action.sa_mask );
292 sigaddset(&action.sa_mask, SIGALRM);
293 sigaddset(&action.sa_mask, SIGHUP);
294 sigaddset(&action.sa_mask, SIGUSR1);
295 sigaddset(&action.sa_mask, SIGINT);
297 sigaddset(&action.sa_mask, SIGUSR2);
299 action.sa_flags = SA_RESTART;
300 if ( sigaction( SIGTERM, &action, NULL ) < 0 ) {
301 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
302 afp_dsi_die(EXITERR_SYS);
306 /* Added for server message support */
307 action.sa_handler = afp_dsi_getmesg;
308 sigemptyset( &action.sa_mask );
309 sigaddset(&action.sa_mask, SIGALRM);
310 sigaddset(&action.sa_mask, SIGTERM);
311 sigaddset(&action.sa_mask, SIGUSR1);
312 sigaddset(&action.sa_mask, SIGHUP);
313 sigaddset(&action.sa_mask, SIGINT);
314 action.sa_flags = SA_RESTART;
315 if ( sigaction( SIGUSR2, &action, NULL) < 0 ) {
316 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
317 afp_dsi_die(EXITERR_SYS);
319 #endif /* SERVERTEXT */
321 /* SIGUSR1 - set down in 5 minutes */
322 action.sa_handler = afp_dsi_timedown;
323 sigemptyset( &action.sa_mask );
324 sigaddset(&action.sa_mask, SIGALRM);
325 sigaddset(&action.sa_mask, SIGHUP);
326 sigaddset(&action.sa_mask, SIGTERM);
327 sigaddset(&action.sa_mask, SIGINT);
329 sigaddset(&action.sa_mask, SIGUSR2);
331 action.sa_flags = SA_RESTART;
332 if ( sigaction( SIGUSR1, &action, NULL) < 0 ) {
333 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
334 afp_dsi_die(EXITERR_SYS);
337 /* SIGINT - enable max_debug LOGging to /tmp/afpd.PID.XXXXXX */
338 action.sa_handler = afp_dsi_debug;
339 sigfillset( &action.sa_mask );
340 action.sa_flags = SA_RESTART;
341 if ( sigaction( SIGINT, &action, NULL) < 0 ) {
342 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
343 afp_dsi_die(EXITERR_SYS);
348 action.sa_handler = alarm_handler;
349 sigemptyset(&action.sa_mask);
350 sigaddset(&action.sa_mask, SIGHUP);
351 sigaddset(&action.sa_mask, SIGTERM);
352 sigaddset(&action.sa_mask, SIGUSR1);
353 sigaddset(&action.sa_mask, SIGINT);
355 sigaddset(&action.sa_mask, SIGUSR2);
357 action.sa_flags = SA_RESTART;
358 if ((sigaction(SIGALRM, &action, NULL) < 0) ||
359 (setitimer(ITIMER_REAL, &dsi->timer, NULL) < 0)) {
360 afp_dsi_die(EXITERR_SYS);
362 #endif /* DEBUGGING */
364 /* get stuck here until the end */
365 while ((cmd = dsi_receive(dsi))) {
367 child.flags &= ~CHILD_SLEEPING;
368 dsi_sleep(dsi, 0); /* wake up */
370 if (reload_request) {
372 load_volumes(child.obj);
379 /* The first SIGINT enables debugging, the second one kills us */
380 action.sa_handler = afp_dsi_die;
381 sigfillset( &action.sa_mask );
382 action.sa_flags = SA_RESTART;
383 if ( sigaction( SIGINT, &action, NULL ) < 0 ) {
384 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
385 afp_dsi_die(EXITERR_SYS);
388 sprintf(logstr, "default log_maxdebug /tmp/afpd.%u.XXXXXX", getpid());
392 if (cmd == DSIFUNC_TICKLE) {
393 /* timer is not every 30 seconds anymore, so we don't get killed on the client side. */
394 if ((child.flags & CHILD_DIE))
396 pending_request(dsi);
400 child.flags |= CHILD_DATA;
404 LOG(log_info, logtype_afpd, "done");
411 if ( flushfork( writtenfork ) < 0 ) {
412 LOG(log_error, logtype_afpd, "main flushfork: %s", strerror(errno) );
418 function = (u_char) dsi->commands[0];
420 /* send off an afp command. in a couple cases, we take advantage
421 * of the fact that we're a stream-based protocol. */
422 if (afp_switch[function]) {
423 dsi->datalen = DSI_DATASIZ;
424 child.flags |= CHILD_RUNNING;
426 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
428 err = (*afp_switch[function])(obj,
429 (char *)&dsi->commands, dsi->cmdlen,
430 (char *)&dsi->data, &dsi->datalen);
432 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
433 AfpNum2name(function), AfpErr2name(err));
435 /* bring everything back to old euid, egid */
437 restore_uidgid ( &obj->uidgid );
438 #endif /* FORCE_UIDGID */
439 child.flags &= ~CHILD_RUNNING;
441 LOG(log_error, logtype_afpd, "bad function %X", function);
446 /* single shot toggle that gets set by dsi_readinit. */
452 if (!dsi_cmdreply(dsi, err)) {
453 LOG(log_error, logtype_afpd, "dsi_cmdreply(%d): %s", dsi->socket, strerror(errno) );
454 afp_dsi_die(EXITERR_CLNT);
458 case DSIFUNC_WRITE: /* FPWrite and FPAddIcon */
459 function = (u_char) dsi->commands[0];
460 if ( afp_switch[ function ] != NULL ) {
461 dsi->datalen = DSI_DATASIZ;
462 child.flags |= CHILD_RUNNING;
463 err = (*afp_switch[function])(obj,
464 (char *)&dsi->commands, dsi->cmdlen,
465 (char *)&dsi->data, &dsi->datalen);
466 child.flags &= ~CHILD_RUNNING;
468 /* bring everything back to old euid, egid */
470 restore_uidgid ( &obj->uidgid );
471 #endif /* FORCE_UIDGID */
473 LOG(log_error, logtype_afpd, "(write) bad function %x", function);
478 if (!dsi_wrtreply(dsi, err)) {
479 LOG(log_error, logtype_afpd, "dsi_wrtreply: %s", strerror(errno) );
480 afp_dsi_die(EXITERR_CLNT);
484 case DSIFUNC_ATTN: /* attention replies */
487 /* error. this usually implies a mismatch of some kind
488 * between server and client. if things are correct,
489 * we need to flush the rest of the packet if necessary. */
491 LOG(log_info, logtype_afpd,"afp_dsi: spurious command %d", cmd);
492 dsi_writeinit(dsi, dsi->data, DSI_DATASIZ);
496 pending_request(dsi);
500 afp_dsi_die(EXITERR_CLNT);